lull: add %'PATCH' to $method:http

As of RFC 5789, PATCH is a valid HTTP request method. The $method:http type,
however, did not include it.

Here, we add it to the $method:http type, so that it now includes all nine
standard HTTP methods.

pkg/arvo/sys/lull.hoon

@@ -585,6 +585,7 @@
         %'GET'
         %'HEAD'
         %'OPTIONS'
+        %'PATCH'
         %'POST'
         %'PUT'
         %'TRACE'